Title: Networked Control Systems: control structures with bandwidth limitations

Authors: Vicente Casanova, Julian Salt, Angel Cuenca, Ricardo Piza

Addresses: Departamento de Ingenieria de Sistemas y Automatica, Universidad Politecnica de Valencia, Camino de Vera s/n. 46022, Valencia, Spain. ' Departamento de Ingenieria de Sistemas y Automatica, Universidad Politecnica de Valencia, Camino de Vera s/n. 46022, Valencia, Spain. ' Departamento de Ingenieria de Sistemas y Automatica, Universidad Politecnica de Valencia, Camino de Vera s/n. 46022, Valencia, Spain. ' Departamento de Ingenieria de Sistemas y Automatica, Universidad Politecnica de Valencia, Camino de Vera s/n. 46022, Valencia, Spain

Abstract: The aim of this paper is to propose a control to be used in Networked Control Systems. A periodic model of the plant, as it is seen by the controller, is proposed. It can be converted into a multivariable model and used to design a multivariable controller. A second structure becomes a periodic control that uses the plant to supply the lost information. Non linear behaviour, periodicity and any other irregularities can be included in the model. The control is tested on the control of X and Y axis from a model crane, using Profibus-DP to close the loop.

Keywords: networked control systems; bandwidth limitations; shared communication medium; fieldbus; Profibus-DP; periodic model; periodic control; information recovery; model cranes; crane control; multivariable control.

DOI: 10.1504/IJSCC.2009.024556

International Journal of Systems, Control and Communications, 2009 Vol.1 No.3, pp.267 - 296

Published online: 09 Apr 2009 *

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